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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f6558f9a493d99037fd48360c8acd63ce960dd3e79a4c321f3a63fcfda76cfd' 
  AND token = 'u1OjTQRWOzahKBCER7MALAg7FkNEzgt2zDr/5p1N7ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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