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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18fb56fc36ab1d6366361da2d37ee6d5d82e54f04b398b6e82e177f713b93591' 
  AND token = '11cguCTxjb5csky7K1N61IWahDG/sJf6E5Jay6AD8wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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