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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aae783ee201cefad3c852d7f5d69057b20f5d6b12ffda23d795db5b896fd4d53' 
  AND token = 'kjLYCN0sjhCJTI2SQvYStO/HIkSjJzv0cic67fO3bOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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