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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68bee122bb1d473e11d7e63bcc287e6a051dd043e4a86593d22e929ec1ebca51' 
  AND token = 'hI1/xmAFOexHVj9y6oFEwx/OLNNXWy7N7TP5A/aN8Mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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