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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0cb478b8f52ccaddf47b0c0b5cadec67d81a4871d69d8238a924b37c7bf5726' 
  AND token = 'GfmUCxwBMTi3pIjxy0G07Nl0Ex1mrvPeg44cVUXzFRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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