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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7823eaab9ea934e6e51c8e5b947e2d371a3bc8c68ce1ffc633774696a1bca41d' 
  AND token = '4F5Ud7T/fEpSg2pbkOJwKhP3YfE3BwjV1YaJ1+vmcSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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