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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eae30c4ae7bef3c4aff34534136a051e10d1d6ec05af83a87fe1193d20a444e7' 
  AND token = 'j8BxFBLDnItu3OyDHfMXg2SONEAsnZpL6im+1UdPqjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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