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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1582a1b2da1a9b6bebcb7eb55c2be69f06b8f1c374ef465903b77d9bb9e62c02' 
  AND token = 'sw9w3jU4mpRIkmlwUV5TFe/DimT0zlheknW5derpau4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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