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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '870ffa60cee999f12c91ccd6ba1009fc78115c40698d69880708964ed157ce47' 
  AND token = 'pm2d+fkvGdQkb4oU4gW/ylaRFuAMuugKjhBl80o16/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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