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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc06ac02ab79341daa1910f346b54f6614efcf263229d5059ad7b2524d9f2333' 
  AND token = '2U/67dEMigrUb29w1QrEJ+6YeOA3cQz50z33fvpJOas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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