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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeca03f029c36b6af73e294951fab5dd3ef5492ef8224427c22a5741c90ff6e3' 
  AND token = 'RRJAeS/X9+u7y/BsZ9HsTSuMbbu4SIXvcqH7kwBfAI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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