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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b57464713ecb26c0ccd3fc9721ee3d358b30f05945c8f9ee8370ae69c86cafc7' 
  AND token = 'cbA0TyxHgaMca36oQ402TAQqkVXB+3LIgbC4fjDXOIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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