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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82b062fb366108008cb97e4cc9d8cd40457d6cf4ba51a17e57ba4b69c85ce69b' 
  AND token = 'BAUxh5oSTC638I2ixJkGkHsqsv3eFWw1pOcm5JIGGxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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