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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2adc7bb749ff6c04ad1b3e5835d57202dd104730d627b5ead6659704fb8fceea' 
  AND token = 'hP/TFZpobb9nSJvSYIm+7NMJQfq2d7ugE2Oh4UOqINY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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