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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52736a9069281dba116a0de0abdbda71420773af12a0b06109726ed5eca6920d' 
  AND token = 'sTu6zkDZb5HFu6jhZCjaSgu6yj9NZ+R+5/8NNiAy16g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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