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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03067ab1916e7810ab0d4bf2f887f975567387afd328c294eae6510ce493d866' 
  AND token = 'hn7i4LTvSEeTZjrz8JS1F/RAhe8SDjAXDY5vetSqO/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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