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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '517a02cddfd755e43f0ff396f757005ba0e5126fc72f96fea0060d691204fdfc' 
  AND token = 'yI2n6KnrwRA+SOaNKcuR8axjZp3UHzcrkWShEAC2nhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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