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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0325515243326061f7708f9b974b0174c80b3a2b6cb3f0a9737438e0b51e0ade' 
  AND token = 'WJo4OxRkw7IWtSC6PtRP9pIMl8P859/Fo3rCdseS6C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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