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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d651fd38685b48903c2d8151aaf9a56bece2386c6425aa141da5220acd2b14b' 
  AND token = '1LBYBFSDewmIndU2KdmlDAZafViKCVKYewzRMyBJx1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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