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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5b986679dccd8d79221894c1dc11b2609b6860ff508f5c81e4accee5f3e46e0' 
  AND token = 'hsMsTXRt3FNaH7TLJ93/AWu7ZO6HBy4/JBEWdkoV36E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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