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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9802caff103c6829ddf02666ce6a4d9fd29de2ef4e0e1702f119c33c88888c5a' 
  AND token = 'MEomEny+IO9rG2neohpu7KcNKgSJYwyHkLT5te3WGn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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