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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99d4acc8aa2c9128118d23e82bdcc7db50b578cc74ab7e601b2b86bc23add5ba' 
  AND token = 'CAcV61xvRNBFFuqICj/R55ibmdK64A/KdH7Fl5kE+AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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