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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70643ff4e8c70f093e45dc70bfee513789e6fad2b35fd5ff12d68f3277042e44' 
  AND token = 'hORwMSjFiQ4h4ZtkPPtKutZTiZd5VWiXTStP0JS9zqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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