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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f32d62df36e4980a7d745db20a64d225c100920d6850915f6b6d39699c44e5f' 
  AND token = '0I/Ut2kddpE/c0cwCPb3Y19biB1/6ARhPqd6V6UnTG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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