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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08008c13c9aae9d65bb01c9e176211b12e5de77be2f152f5c550a3d34c9e1e9a' 
  AND token = 'AMHzs+l+6Kawdav5No8tlOiZ8shRmnurYmur42iHvlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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