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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b82b527bf4cedf6274067f91318fd84d2296fd8818841c457ea0265a0901f134' 
  AND token = 'w6VPzPKR/cpMrbLEdod2SaafnQtczZOURN5tm2fIVow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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