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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a23e6903e990a2e9d9e8a562b11b2b19d9ba5168e7ec93b6c884541e796142d' 
  AND token = 'raEC2tonEoCnuiwPxH/8Aar0CYYlH+ir2huYrWs08Co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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