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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eef55ea907a5a448f5f0776beb7cf6f1a657be5dd246bb453f4c97614edf7df' 
  AND token = 'KCwYCOxb9b4GgGPxHgKExktGlaE7i1QKD501r/q3ly0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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