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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0079a42da631463596c20c722e920782e16f8af32803269fab6c57c563c66ef9' 
  AND token = 'BjUhs+Y20Woq7JKuWNPZ3S6ljoqo7Qa7Lt5ItFTS+ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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