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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb3c47d301e7ad0b5d4392e4c8c7ac75bb0ed1a0616ca3a643f8dd14e5dc6332' 
  AND token = '1jOgzjW1pzMGmHhGDjfP85jHklESn0cxCq4DRFxRbi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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