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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc8cdb84df2e8be2d92a5b857c0e353c2610e56db0c0bc5510d6bcf7c9566a92' 
  AND token = 'z/OMu8WwUT+hbrC/4eDw5H1zbXHq/IOjlZd02MAGqpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}