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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0287d4ba32cb7cf7f9e1c1bbddcb5d2d836308ce87df1c7774b12c7ab0dd212' 
  AND token = '3o/KUZF5vKoBb65aB4iB2WWR86MK13mXl2q8iveprs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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