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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1dc5280d3c12cf06d878990568f5517b99fe44a2e264c88485a6b78201c3dba' 
  AND token = 'QVn5TKIsPKUdclwLUsEU3+dMEpL0vIfk8EKS0M1gjGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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