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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cbfa490b313e4017bcd2e0c090fc657908b647ee3c1d1a3dac62426fc457538' 
  AND token = '1h+CUVa7cNk2njUvmEkEKfJeBBPKDI6diJZLTJxywFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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