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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b16260e82e39983c2c513c2a7e45e42cd55e8c4b1de8bacfe2862bc1963201e0' 
  AND token = 'SKHX0U/3/gZ6MpJJ8SznYeBjvqdQQZok1HEUg1flptg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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