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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2799b207ea43feff4b01becfe2ff27529eacc388a495e0fa4fafbb96ee46645e' 
  AND token = 'CgoT+XspBvpYeCfKtgWwKfqwLcJ8UlcAlirvgL5lkvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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