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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '147f3b8545b19be0c8e688585f4da0843e2ed974b512d324a488d8c103b55b8b' 
  AND token = 'GHg25GychvsTxwfX1xafT+V3XP+ZyYZMfU1GS5WD4To=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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