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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b9bd115c872e1085cb5f96c7c215f890fcc4e2036d0085c95f8685ac4a395b0' 
  AND token = 'MPuy8gDlxAFZJJLjD/bJlXKDegJK65f3YwEtoQO6LQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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