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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0abf4a6f1c34f4e1a1e3dc93c6c07e281869d7ebe462fc371e501f73e9770291' 
  AND token = 'lx02mb9M0HD4c2aUbv91MTaN8pb2Hqhkk2hmXdyzq7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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