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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '167bc76a47a93a029bc73d646f7959d48942b375b356777020e224388751be87' 
  AND token = 'LYYh5BrFIkbUg7fHaoWxAbxL+E95b1GQWEowOzIZHKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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