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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '283a25141535fb9380dfc028a91f6738765662cfa11a1970a9913544155ec696' 
  AND token = 'KnlbrTmUwlsdLZA9gqk0QJ3A7C5g3wd97K5qmls9X3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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