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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6fd4de90076f5ad2f6005cdea0516fc0951d37ca45b6e12742f80158729f5ff' 
  AND token = '8q+Hn9f7Ce9zjzTY+ziCvDxNMR0EOuElg73Ni1E31Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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