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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c4eae5b41852f6bab408196c74c5f97b0bd26a1a5c8b322aeca282ab368b7d5' 
  AND token = 'FnfhHlBUMtLgSenBr5R1PIakkBvhKqNUjZiYIiRZoHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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