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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef387a311073ce0ec434e11eddab502df71431da4472bc4ae520682ec15b3d80' 
  AND token = 'p2XP8ycswFkcWzDewsXz9GyPOU065I5sPFp7VhwnNVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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