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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '956f4feb43ca522e58c5282e9fc22e7cf36ea7fa3dc8371ff012770b41782d2a' 
  AND token = 'qtDDbnm8+gGAbdY6oh8ZrAudED7bnpt8DrbkgfLnW64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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