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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10f58a407f125a32c36cd5214ca18c98c69f768b10e594dc75de8e527950a9e0' 
  AND token = 'SlkqsLQRrZBukYHPGnd5R35/Ploi7xEjB7C5n3q2+Wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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