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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6a30ae8e44103f05ca833dcc28d6cd9a926d79dd4a9c864a5ff1401c9abafcc' 
  AND token = '0W2Api2ztWTCrf7iFSweqhX9/CgLuUp3PRrOFeLPAzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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