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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50bc4ecbf65445c6e2e54e6480edcceae355e47cce951484c84e78db973a0269' 
  AND token = 'cVgB7nYa9sfexdrr8qjbRquTZqqtRJeG61o/Oww9yVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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