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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '229815363bf5c9e00d9d191422b16bcfc468fc14def97d459b7a19e10b3f0ff4' 
  AND token = 'zQykcDoStBBgmbbjBV7JehRim3CfiEhyVsgmynrw+eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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