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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a222de4ef0ed29cbcd9f929e6051ca6f981753490e3096384ff1bd467bb9398' 
  AND token = '385bXl4CE4o6l2U/faqjjIGb59FzV6mLacoeY/B5Qwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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