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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7672362d94a09f85bbb7392ab82e37d3f570c47bcc0c9ba9df55bd721ea42368' 
  AND token = 'VhhJdZ0YHajG4HxfDbJre9gviFLdv3PyJHw2P4HdYkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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