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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da0d64e76207d2f7f5ab42056409049f0314bb297bffd4a212eff08f5b8eccbc' 
  AND token = 'qq9MHezYLiKr1X4GCtBxo/c2beP3EwPhHKpsqzxqhpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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