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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b5407b098f868dbff44972ecb5e5795f248456bd00752fc6c7a1cab26ae1310' 
  AND token = 'OTCUWXwd2KrCDOIdxp55w4Kyft4eR2U1HRHZm2+ubow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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