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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b880c4b2b0dc24e8e59368600e7ce2a0aabdf992a9c7dc49a0d06b9dbacd62a' 
  AND token = 'dIxtkCf4KQ755r/DVgZyqKXoFG573RylAVPah8p4d7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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