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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72fdf30acf4124ef6a2e7ead4ce4a5227b40f2bce47ce9152de3f437815d45d2' 
  AND token = 'rvebsdiI8dv7NWEt7VtIn4XSvoQxyBftRdykGM9K5gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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