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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bcf5bb8d3f2bb00bcb5667c1c2e23641150f2337b8dd4b8fab9eb0ba85e0996' 
  AND token = 'hdXVqsDiBA2YQor9i9BAxnj7jdBrK+GDtwsR1Otq9to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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