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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2718d0ef65552d3724c40df8cee40df97f7f2c7ce7e09e6c76a02f9c6d22acd8' 
  AND token = 'zW5G3RVdASTaMFxrWvXiv31U1694+HyJqgz6K+T+8ZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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