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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f915ad5bf38e6324e9cea4028a09c53861c5d17eb4184a8b91f14e63ce7ad09d' 
  AND token = 'ZAIRGNJO1X1DOizjAy+F0oydM7PaVojRewXCxBEfq+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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